Nikon TC-20E film camera This first series of Pentax

This first series of Pentax K-mount lenses is more heavily built than the later Pentax-M lenses

the bar has a movable tripod mount with a 1/4"-20 interior thread for mounting to your tripod

This lens is designed for the Canon EF mount

Nice and compact

and sharpens up nicely by f2 if you've decided you're buying an f1

Nikon TC-20E film camera This first series of PentaxThe Nikon TC 20E is an autofocus teleconverter designed for select Nikon AF I and AF S telephoto lenses (here's Nikon's product page with details). Doubles focal length of compatible lenses, at the cost of two stops of light. In excellent condition, with very minor cosmetic wear.